Darke by Angie Sage-- Ben F.

Inference: I think that the darkness is a power to be reckoned with. They have already tried to contain the darkness by using a powerful spell but it is deteriorating. That is why I think that the darkness is a force to be reckoned with. I know this because it took most of the power from the best wizards to just contain it, let alone destroy it. That is saying a lot about how much power it needs to be destroyed.